What you have heard is too brief to make a judgment. You need to specify the conditions, such as whether this lawsuit is a civil lawsuit or a criminal lawsuit, who is the person who amended the testimony in the lawsuit, the extent and circumstances of the amendment, and so on. The following are the relevant provisions on obstruction of justice for your reference:
Article 305 In criminal proceedings, witnesses, expert witnesses, recorders and translators who intentionally make false proofs, expert appraisals, records and translations of important cases with the intention of framing others or concealing criminal evidence shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.
Article 306 In criminal proceedings, defenders and agents ad litem who destroy or forge evidence, help the parties to destroy or forge evidence, threaten or induce witnesses to change their testimony of facts or commit perjury shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.
Witness testimony or other evidence provided, presented or quoted by defenders or agents ad litem is inaccurate, not intentionally forged, and does not belong to forged evidence.
Article 307 Whoever prevents a witness from testifying or instructs others to commit perjury by violence, threat or bribery shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.
Whoever helps a party destroy or forge evidence, if the circumstances are serious, shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention.
Any judicial officer who commits the crimes mentioned in the preceding two paragraphs shall be given a heavier punishment.
I hope my answer can help you!